Groups > sci.electronics.design > #454355

Identification of modules

From	Piotr Wyderski <peter.pan@neverland.mil>
Newsgroups	sci.electronics.design
Subject	Identification of modules
Date	2017-03-31 09:21 +0200
Organization	ATMAN - ATM S.A.
Message-ID	<obl01o$8a8$1@node2.news.atman.pl> (permalink)

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My system will be composed of a number of free slots
which can be populated with some modules (mostly
containing power electronics). The simplest the module
is, the better, don't want to use a micro to do the
job because of its limited FLASH/EEPROM retention time.

The module must be able to report its identity to the
main controller (one from the closed universe of, say,
32 possibilities known in advance) and which slot it
occupies. A very useful feature would be to have
a temperature sensor of some kind for moderate overload
detection.

I cannot afford many pins to do that, so the simplest
5+5 pin solution of binary encoding the relevant
information is not an option.

I came up with the idea to (ab)use the Maxim's DS2438
battery monitor and use its voltage/current sensor A/D
channels to fetch the value encoded by a resistive divider.
The temperature sensor is there for free and the cost is
below a buck for 20 pieces in China. It supports the 1-wire
bus.

Do you know anything simpler/better or is there
anything to worry about that Maxim part?

BTW, why are the Maxim parts so insanely expensive?
I could find many applications for the 1-wire DS2450
A/D converter, but the cost makes it pointless -- one
can emulate it with any SO8 micro for 1/4 of its price.

	Best regards, Piotr

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Thread

Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 09:21 +0200
  Re: Identification of modules Don Y <blockedofcourse@foo.invalid> - 2017-03-31 01:31 -0700
    Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 10:36 +0200
      Re: Identification of modules Don Y <blockedofcourse@foo.invalid> - 2017-03-31 02:16 -0700
        Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 11:39 +0200
          Re: Identification of modules Tom Gardner <spamjunk@blueyonder.co.uk> - 2017-03-31 11:32 +0100
            Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 12:59 +0200
          Re: Identification of modules Don Y <blockedofcourse@foo.invalid> - 2017-03-31 11:55 -0700
    Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 11:30 +0200
  Re: Identification of modules rickman <gnuarm@gmail.com> - 2017-03-31 05:20 -0400
    Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 11:53 +0200
      Re: Identification of modules rickman <gnuarm@gmail.com> - 2017-03-31 06:16 -0400
        Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 12:39 +0200
          Re: Identification of modules rickman <gnuarm@gmail.com> - 2017-03-31 13:27 -0400
            Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 22:14 +0200
              Re: Identification of modules rickman <gnuarm@gmail.com> - 2017-03-31 17:48 -0400
                Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-04-03 10:57 +0200
    Re: Identification of modules John Devereux <john@devereux.me.uk> - 2017-03-31 11:39 +0100
      Re: Identification of modules rickman <gnuarm@gmail.com> - 2017-03-31 13:38 -0400
        Re: Identification of modules Piotr Wyderski <peter.pan@neverland.mil> - 2017-03-31 22:21 +0200
  Re: Identification of modules Joe Chisolm <jchisolm6@earthlink.net> - 2017-03-31 13:02 -0500
  Re: Identification of modules Tim Wescott <seemywebsite@myfooter.really> - 2017-03-31 16:18 -0500

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